But LG cannot by definition, except if they momentarily act like non LG's by reproducing with other partners against their own sexual preferences.
And that if they _do_ have the will to reproduce, considering that in primates in nature it's a strictly heterosexual deal (and in fact, the male/female sexes were evolved as a means to that very end).
In addition, for several prominent LG thinkers, "gay marriage" and "having a baby" (surrogates, etc), is the losing proposition of adopting/mimicking the dominant paradigm. Essentially it's the opposite of feminism.
I can see this happening in nature if maybe both of the original parents got killed off or something. The presence of homo-penguins means that the offspring might get rescued and safely reared by the happy couple instead of perishing.